Guesses include botched plastic surgery to vitiligo to "really bad make up" but unless Mr. Sosa was looking for some way to make his eyes more lemur-like, I don't think this was intentional. SI's little blurb gives no clues either:

Slammin' Sammy is clearly keeping himself occupied these days. Here he arrives with a rather distinguished guest at a Person of the Year ceremony in honor of Juan Gabriel at Mandalay Bay Resort & Casino in Las Vegas on Nov. 4.

Yes. Clearly. Not so clear? Why he now has the same skin tone as Bryce Howard. Come on, SI. Get to the bottom of this.

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